96755ecd21
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48 lines
1.6 KiB
Python
48 lines
1.6 KiB
Python
import sys
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import os
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import logging
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if sys.platform != "win32":
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import fcntl
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from aw_core.dirs import get_cache_dir
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logger = logging.getLogger(__name__)
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class SingleInstance:
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"""
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This code is taken and modified form the tendo python package
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(Python Software Foundation License Version 2)
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http://pythonhosted.org/tendo/_modules/tendo/singleton.html
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"""
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def __init__(self, client_name):
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self.lockfile = os.path.join(get_cache_dir("client_locks"), client_name)
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logger.debug("SingleInstance lockfile: " + self.lockfile)
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if sys.platform == "win32":
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try:
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# file already exists, we try to remove (in case previous execution was interrupted)
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if os.path.exists(self.lockfile):
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os.unlink(self.lockfile)
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self.fd = os.open(self.lockfile, os.O_CREAT | os.O_EXCL | os.O_RDWR)
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except OSError as e:
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if e.errno == 13:
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logger.error("Another instance is already running, quitting.")
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sys.exit(-1)
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else:
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raise e
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else: # non Windows
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self.fp = open(self.lockfile, "w")
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try:
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fcntl.lockf(self.fp, fcntl.LOCK_EX | fcntl.LOCK_NB)
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except OSError:
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logger.error("Another instance is already running, quitting.")
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sys.exit(-1)
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def __del__(self):
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if sys.platform == "win32":
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if hasattr(self, "fd"):
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os.close(self.fd)
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os.unlink(self.lockfile)
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